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Optris CTratio Series
Precision Measurement Using Ratio Technology
When temperature measurement becomes difficult, the Optris CTratio Series delivers clarity.
Designed for extreme industrial environments, the CTratio Series uses advanced two-colour (ratio) technology to measure high temperatures accurately, even when conditions are far from ideal.
Dust, steam, obstructed views or changing surface conditions will not hinder its ability to measure temperatures accurately. Where standard infrared sensors struggle, the CTratio continues to provide stable, repeatable readings.
Built with a fibre-optic sensing head and separate electronics, it’s made for high ambient temperatures, tight installation spaces and demanding processes.
Not sure if a ratio pyrometer is right for your application?
Speak with our team to find the best solution for your process and get expert advice on your temperature measurement setup.
Call us on
1800 811 818
Key Features
- Two-colour (ratio) measurement technology for reliable readings
- Temperature ranges up to 3000°C for extreme applications
- Fibre-optic sensing head for high ambient environments
- Laser sighting for accurate alignment at any distance
- Fast response time (as low as 1 ms) for dynamic processes
- High optical resolution (up to 100:1) for small targets
- Electrically isolated sensor head for safe operation
- Dual analogue outputs (4–20 mA) for control integration
- Compact design for tight installation spaces
Why Choose the CTratio Series
Accurate in challenging conditions
Unlike single wavelength sensors, ratio pyrometers measure infrared energy at two wavelengths, allowing accurate readings even when emissivity changes or the signal is partially blocked.
Handles dust, steam and obstruction
Maintain measurement accuracy even with up to 90% signal attenuation from dirty windows, dust or steam.
Designed for extreme heat
Measure temperatures up to 3000°C, with sensor heads capable of operating in high ambient environments without cooling.
Flexible installation
Fibre-optic cable design allows separation of sensing head and electronics, giving greater flexibility in mounting and protection.
Built for Difficult Applications
The CTratio Series is engineered for applications where measurement is traditionally unreliable:
- Metal processing (molten metal, forging, rolling)
- Glass and ceramics manufacturing
- Semiconductor production
- Heat treatment and furnaces
- Fast moving or partially visible targets
Its ability to measure accurately when the target is small, moving, or partially obstructed makes it ideal for complex industrial environments.
How Ratio Pyrometry Works
Traditional infrared sensors rely on a single wavelength, making them sensitive to emissivity changes and environmental interference.
The CTratio Series uses two wavelengths and calculates the ratio between them, allowing:
- Reduced sensitivity to emissivity changes
- Reliable measurement through dust, smoke and steam
- Accurate readings even when the target doesn’t fully fill the measurement spot
This results in more stable and repeatable measurements, even in harsh or inconsistent conditions.
Explore Other Infrared Solutions
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CTi Series
Small sensing head, separate electronics box
Frequently Asked Questions
What is a ratio pyrometer?
A ratio pyrometer measures temperature using two infrared wavelengths, allowing accurate readings even when emissivity changes or the signal is partially obstructed.
When should I use a CTratio sensor?
Use it in environments with dust, steam, or changing surface conditions, especially for high-temperature metal processes.
Can it measure small or moving targets?
Yes. The CTratio Series can measure targets that only partially fill the measurement spot or are moving quickly.
How hot can the CTratio measure?
Depending on the model, it can measure temperatures up to 3000°C.
Does it need cooling in hot environments?
No. The fibre-optic sensing head can withstand high ambient temperatures without cooling in many applications.
What industries use ratio pyrometers?
Common industries include metal processing, glass manufacturing, semiconductors, and high-temperature industrial processing.
How does it handle dirty environments?
It remains accurate even with dust, steam or dirty viewing windows, maintaining reliable measurement despite signal interference.
What outputs are available?
Typically includes analogue outputs (4–20 mA), with options for digital communication and software integration.
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